Q. A siren emitting sound of frequency $800\ Hz$ is going away from a static listener with a speed of $30\ m/s,$ frequency of the sound to be heard by the listener is (take velocity of sound as $330\ m/s$)

A) $733.3\ Hz$
B) $644.8\ Hz$
C) $481.2\ Hz$
D) $286.5\ Hz$
Explanation

(a) $n^{'} = n\left( \frac{v}{v + v_{S}} \right) = 800\left( \frac{330}{330 + 30} \right) = 733.33\ Hz$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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